The rest are not official, because they are simply not important enough to care about. Australia used to be a continent until Russell Crowe was born, then they lost their privileges. Africa is probably not real, and Antarctica doesn't have any countries on it, but they both wish that they were continents. Europe is not a continent because it is not a standalone landmass and does not have the blessing of Christ; thus, Europe is incontinent.

An important exception to the continents is wherever Dr. Colbert stands, the ground becomes a part of the American continent. Luckily, he stands all over the place at the same time.